utils/exportfs/exportfs.c

   1 /*
   2  * utils/exportfs/exportfs.c
   3  *
   4  * Export file systems to knfsd
   5  *
   6  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   7  *
   8  * Extensive changes, 1999, Neil Brown <neilb@cse.unsw.edu.au>
   9  */
  10
  11 #ifdef HAVE_CONFIG_H
  12 #include <config.h>
  13 #endif
  14
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/vfs.h>
  18 #include <sys/stat.h>
  19 #include <sys/file.h>
  20 #include <unistd.h>
  21 #include <stdbool.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <stdarg.h>
  25 #include <getopt.h>
  26 #include <fcntl.h>
  27 #include <netdb.h>
  28 #include <errno.h>
  29 #include <dirent.h>
  30
  31 #include "sockaddr.h"
  32 #include "misc.h"
  33 #include "nfslib.h"
  34 #include "exportfs.h"
  35 #include "xlog.h"
  36
  37 static void     export_all(int verbose);
  38 static void     exportfs(char *arg, char *options, int verbose);
  39 static void     unexportfs(char *arg, int verbose);
  40 static void     exports_update(int verbose);
  41 static void     dump(int verbose);
  42 static void     error(nfs_export *exp, int err);
  43 static void     usage(const char *progname);
  44 static void     validate_export(nfs_export *exp);
  45 static int      matchhostname(const char *hostname1, const char *hostname2);
  46 static void     export_d_read(const char *dname);
  47 static void grab_lockfile(void);
  48 static void release_lockfile(void);
  49
  50 static const char *lockfile = EXP_LOCKFILE;
  51 static int _lockfd = -1;
  52
  53 /*
  54  * If we aren't careful, changes made by exportfs can be lost
  55  * when multiple exports process run at once:
  56  *
  57  *      exportfs process 1      exportfs process 2
  58  *      ------------------------------------------
  59  *      reads etab version A    reads etab version A
  60  *      adds new export B       adds new export C
  61  *      writes A+B              writes A+C
  62  *
  63  * The locking in support/export/xtab.c will prevent mountd from
  64  * seeing a partially written version of etab, and will prevent
  65  * the two writers above from writing simultaneously and
  66  * corrupting etab, but to prevent problems like the above we
  67  * need these additional lockfile() routines.
  68  */
  69 static void
  70 grab_lockfile()
  71 {
  72         _lockfd = open(lockfile, O_CREAT|O_RDWR, 0666);
  73         if (_lockfd != -1)
  74                 lockf(_lockfd, F_LOCK, 0);
  75 }
  76 static void
  77 release_lockfile()
  78 {
  79         if (_lockfd != -1)
  80                 lockf(_lockfd, F_ULOCK, 0);
  81 }
  82
  83 int
  84 main(int argc, char **argv)
  85 {
  86         char    *options = NULL;
  87         char    *progname = NULL;
  88         int     f_export = 1;
  89         int     f_all = 0;
  90         int     f_verbose = 0;
  91         int     f_reexport = 0;
  92         int     f_ignore = 0;
  93         int     i, c;
  94         int     new_cache = 0;
  95         int     force_flush = 0;
  96
  97         if ((progname = strrchr(argv[0], '/')) != NULL)
  98                 progname++;
  99         else
 100                 progname = argv[0];
 101
 102         xlog_open(progname);
 103         xlog_stderr(1);
 104         xlog_syslog(0);
 105
 106         export_errno = 0;
 107
 108         while ((c = getopt(argc, argv, "aio:ruvf")) != EOF) {
 109                 switch(c) {
 110                 case 'a':
 111                         f_all = 1;
 112                         break;
 113                 case 'i':
 114                         f_ignore = 1;
 115                         break;
 116                 case 'o':
 117                         options = optarg;
 118                         break;
 119                 case 'r':
 120                         f_reexport = 1;
 121                         f_all = 1;
 122                         break;
 123                 case 'u':
 124                         f_export = 0;
 125                         break;
 126                 case 'v':
 127                         f_verbose = 1;
 128                         break;
 129                 case 'f':
 130                         force_flush = 1;
 131                         break;
 132                 default:
 133                         usage(progname);
 134                         break;
 135                 }
 136         }
 137
 138         if (optind != argc && f_all) {
 139                 xlog(L_ERROR, "extra arguments are not permitted with -a or -r");
 140                 return 1;
 141         }
 142         if (f_ignore && (f_all || ! f_export)) {
 143                 xlog(L_ERROR, "-i not meaningful with -a, -r or -u");
 144                 return 1;
 145         }
 146         if (f_reexport && ! f_export) {
 147                 xlog(L_ERROR, "-r and -u are incompatible");
 148                 return 1;
 149         }
 150         new_cache = check_new_cache();
 151         if (optind == argc && ! f_all) {
 152                 if (force_flush) {
 153                         if (new_cache)
 154                                 cache_flush(1);
 155                         else {
 156                                 xlog(L_ERROR, "-f is available only "
 157                                         "with new cache controls. "
 158                                         "Mount /proc/fs/nfsd first");
 159                                 return 1;
 160                         }
 161                         return 0;
 162                 } else {
 163                         xtab_export_read();
 164                         dump(f_verbose);
 165                         return 0;
 166                 }
 167         }
 168
 169         /*
 170          * Serialize things as best we can
 171          */
 172         grab_lockfile();
 173         atexit(release_lockfile);
 174
 175         if (f_export && ! f_ignore) {
 176                 export_read(_PATH_EXPORTS);
 177                 export_d_read(_PATH_EXPORTS_D);
 178         }
 179         if (f_export) {
 180                 if (f_all)
 181                         export_all(f_verbose);
 182                 else
 183                         for (i = optind; i < argc ; i++)
 184                                 exportfs(argv[i], options, f_verbose);
 185         }
 186         /* If we are unexporting everything, then
 187          * don't care about what should be exported, as that
 188          * may require DNS lookups..
 189          */
 190         if (! ( !f_export && f_all)) {
 191                 /* note: xtab_*_read does not update entries if they already exist,
 192                  * so this will not lose new options
 193                  */
 194                 if (!f_reexport)
 195                         xtab_export_read();
 196                 if (!f_export)
 197                         for (i = optind ; i < argc ; i++)
 198                                 unexportfs(argv[i], f_verbose);
 199                 if (!new_cache)
 200                         rmtab_read();
 201         }
 202         if (!new_cache) {
 203                 xtab_mount_read();
 204                 exports_update(f_verbose);
 205         }
 206         xtab_export_write();
 207         if (new_cache)
 208                 cache_flush(force_flush);
 209         if (!new_cache)
 210                 xtab_mount_write();
 211
 212         return export_errno;
 213 }
 214
 215 static void
 216 exports_update_one(nfs_export *exp, int verbose)
 217 {
 218                 /* check mountpoint option */
 219         if (exp->m_mayexport &&
 220             exp->m_export.e_mountpoint &&
 221             !is_mountpoint(exp->m_export.e_mountpoint[0]?
 222                            exp->m_export.e_mountpoint:
 223                            exp->m_export.e_path)) {
 224                 printf("%s not exported as %s not a mountpoint.\n",
 225                        exp->m_export.e_path, exp->m_export.e_mountpoint);
 226                 exp->m_mayexport = 0;
 227         }
 228         if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
 229                 if (verbose)
 230                         printf("%sexporting %s:%s to kernel\n",
 231                                exp->m_exported ?"re":"",
 232                                exp->m_client->m_hostname,
 233                                exp->m_export.e_path);
 234                 if (!export_export(exp))
 235                         error(exp, errno);
 236         }
 237         if (exp->m_exported && ! exp->m_mayexport) {
 238                 if (verbose)
 239                         printf("unexporting %s:%s from kernel\n",
 240                                exp->m_client->m_hostname,
 241                                exp->m_export.e_path);
 242                 if (!export_unexport(exp))
 243                         error(exp, errno);
 244         }
 245 }
 246
 247
 248 /* we synchronise intention with reality.
 249  * entries with m_mayexport get exported
 250  * entries with m_exported but not m_mayexport get unexported
 251  * looking at m_client->m_type == MCL_FQDN and m_client->m_type == MCL_GSS only
 252  */
 253 static void
 254 exports_update(int verbose)
 255 {
 256         nfs_export      *exp;
 257
 258         for (exp = exportlist[MCL_FQDN].p_head; exp; exp=exp->m_next) {
 259                 exports_update_one(exp, verbose);
 260         }
 261         for (exp = exportlist[MCL_GSS].p_head; exp; exp=exp->m_next) {
 262                 exports_update_one(exp, verbose);
 263         }
 264 }
 265
 266 /*
 267  * export_all finds all entries and
 268  *    marks them xtabent and mayexport so that they get exported
 269  */
 270 static void
 271 export_all(int verbose)
 272 {
 273         nfs_export      *exp;
 274         int             i;
 275
 276         for (i = 0; i < MCL_MAXTYPES; i++) {
 277                 for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
 278                         if (verbose)
 279                                 printf("exporting %s:%s\n",
 280                                        exp->m_client->m_hostname,
 281                                        exp->m_export.e_path);
 282                         exp->m_xtabent = 1;
 283                         exp->m_mayexport = 1;
 284                         exp->m_changed = 1;
 285                         exp->m_warned = 0;
 286                         validate_export(exp);
 287                 }
 288         }
 289 }
 290
 291
 292 static void
 293 exportfs(char *arg, char *options, int verbose)
 294 {
 295         struct exportent *eep;
 296         nfs_export      *exp = NULL;
 297         struct addrinfo *ai = NULL;
 298         char            *path;
 299         char            *hname = arg;
 300         int             htype;
 301
 302         if ((path = strchr(arg, ':')) != NULL)
 303                 *path++ = '\0';
 304
 305         if (!path || *path != '/') {
 306                 xlog(L_ERROR, "Invalid exporting option: %s", arg);
 307                 return;
 308         }
 309
 310         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 311                 ai = host_addrinfo(hname);
 312                 if (ai != NULL) {
 313                         exp = export_find(ai, path);
 314                         hname = ai->ai_canonname;
 315                 }
 316         } else
 317                 exp = export_lookup(hname, path, 0);
 318
 319         if (!exp) {
 320                 if (!(eep = mkexportent(hname, path, options)) ||
 321                     !(exp = export_create(eep, 0)))
 322                         goto out;
 323         } else if (!updateexportent(&exp->m_export, options))
 324                 goto out;
 325
 326         if (verbose)
 327                 printf("exporting %s:%s\n", exp->m_client->m_hostname,
 328                         exp->m_export.e_path);
 329         exp->m_xtabent = 1;
 330         exp->m_mayexport = 1;
 331         exp->m_changed = 1;
 332         exp->m_warned = 0;
 333         validate_export(exp);
 334
 335 out:
 336         freeaddrinfo(ai);
 337 }
 338
 339 static void
 340 unexportfs(char *arg, int verbose)
 341 {
 342         nfs_export      *exp;
 343         struct addrinfo *ai = NULL;
 344         char            *path;
 345         char            *hname = arg;
 346         int             htype;
 347
 348         if ((path = strchr(arg, ':')) != NULL)
 349                 *path++ = '\0';
 350
 351         if (!path || *path != '/') {
 352                 xlog(L_ERROR, "Invalid unexporting option: %s", arg);
 353                 return;
 354         }
 355
 356         if ((htype = client_gettype(hname)) == MCL_FQDN) {
 357                 ai = host_addrinfo(hname);
 358                 if (ai)
 359                         hname = ai->ai_canonname;
 360         }
 361
 362         for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 363                 if (path && strcmp(path, exp->m_export.e_path))
 364                         continue;
 365                 if (htype != exp->m_client->m_type)
 366                         continue;
 367                 if (htype == MCL_FQDN
 368                     && !matchhostname(exp->m_export.e_hostname,
 369                                           hname))
 370                         continue;
 371                 if (htype != MCL_FQDN
 372                     && strcasecmp(exp->m_export.e_hostname, hname))
 373                         continue;
 374                 if (verbose) {
 375 #if 0
 376                         if (exp->m_exported) {
 377                                 printf("unexporting %s:%s from kernel\n",
 378                                        exp->m_client->m_hostname,
 379                                        exp->m_export.e_path);
 380                         }
 381                         else
 382 #endif
 383                                 printf("unexporting %s:%s\n",
 384                                         exp->m_client->m_hostname,
 385                                         exp->m_export.e_path);
 386                 }
 387 #if 0
 388                 if (exp->m_exported && !export_unexport(exp))
 389                         error(exp, errno);
 390 #endif
 391                 exp->m_xtabent = 0;
 392                 exp->m_mayexport = 0;
 393         }
 394
 395         freeaddrinfo(ai);
 396 }
 397
 398 static int can_test(void)
 399 {
 400         int fd;
 401         int n;
 402         char *setup = "nfsd 0.0.0.0 2147483647 -test-client-\n";
 403         fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
 404         if ( fd < 0) return 0;
 405         n = write(fd, setup, strlen(setup));
 406         close(fd);
 407         if (n < 0)
 408                 return 0;
 409         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 410         if ( fd < 0) return 0;
 411         close(fd);
 412         return 1;
 413 }
 414
 415 static int test_export(char *path, int with_fsid)
 416 {
 417         char buf[1024];
 418         int fd, n;
 419
 420         sprintf(buf, "-test-client- %s 3 %d -1 -1 0\n",
 421                 path,
 422                 with_fsid ? NFSEXP_FSID : 0);
 423         fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
 424         if (fd < 0)
 425                 return 0;
 426         n = write(fd, buf, strlen(buf));
 427         close(fd);
 428         if (n < 0)
 429                 return 0;
 430         return 1;
 431 }
 432
 433 static void
 434 validate_export(nfs_export *exp)
 435 {
 436         /* Check that the given export point is potentially exportable.
 437          * We just give warnings here, don't cause anything to fail.
 438          * If a path doesn't exist, or is not a dir or file, give an warning
 439          * otherwise trial-export to '-test-client-' and check for failure.
 440          */
 441         struct stat stb;
 442         char *path = exp->m_export.e_path;
 443         struct statfs64 stf;
 444         int fs_has_fsid = 0;
 445
 446         if (stat(path, &stb) < 0) {
 447                 xlog(L_ERROR, "Failed to stat %s: %m", path);
 448                 return;
 449         }
 450         if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
 451                 xlog(L_ERROR, "%s is neither a directory nor a file. "
 452                         "Remote access will fail", path);
 453                 return;
 454         }
 455         if (!can_test())
 456                 return;
 457
 458         if (!statfs64(path, &stf) &&
 459             (stf.f_fsid.__val[0] || stf.f_fsid.__val[1]))
 460                 fs_has_fsid = 1;
 461
 462         if ((exp->m_export.e_flags & NFSEXP_FSID) || exp->m_export.e_uuid ||
 463             fs_has_fsid) {
 464                 if ( !test_export(path, 1)) {
 465                         xlog(L_ERROR, "%s does not support NFS export", path);
 466                         return;
 467                 }
 468         } else if ( ! test_export(path, 0)) {
 469                 if (test_export(path, 1))
 470                         xlog(L_ERROR, "%s requires fsid= for NFS export", path);
 471                 else
 472                         xlog(L_ERROR, "%s does not support NFS export", path);
 473                 return;
 474
 475         }
 476 }
 477
 478 static _Bool
 479 is_hostname(const char *sp)
 480 {
 481         if (*sp == '\0' || *sp == '@')
 482                 return false;
 483
 484         for (; *sp != '\0'; sp++) {
 485                 if (*sp == '*' || *sp == '?' || *sp == '[' || *sp == '/')
 486                         return false;
 487                 if (*sp == '\\' && sp[1] != '\0')
 488                         sp++;
 489         }
 490
 491         return true;
 492 }
 493
 494 /*
 495  * Take care to perform an explicit reverse lookup on presentation
 496  * addresses.  Otherwise we don't get a real canonical name or a
 497  * complete list of addresses.
 498  */
 499 static struct addrinfo *
 500 address_list(const char *hostname)
 501 {
 502         struct addrinfo *ai;
 503         char *cname;
 504
 505         ai = host_pton(hostname);
 506         if (ai != NULL) {
 507                 /* @hostname was a presentation address */
 508                 cname = host_canonname(ai->ai_addr);
 509                 freeaddrinfo(ai);
 510                 if (cname != NULL)
 511                         goto out;
 512         }
 513         /* @hostname was a hostname or had no reverse mapping */
 514         cname = strdup(hostname);
 515         if (cname == NULL)
 516                 return NULL;
 517
 518 out:
 519         ai = host_addrinfo(cname);
 520         free(cname);
 521         return ai;
 522 }
 523
 524 static int
 525 matchhostname(const char *hostname1, const char *hostname2)
 526 {
 527         struct addrinfo *results1 = NULL, *results2 = NULL;
 528         struct addrinfo *ai1, *ai2;
 529         int result = 0;
 530
 531         if (strcasecmp(hostname1, hostname2) == 0)
 532                 return 1;
 533
 534         /*
 535          * Don't pass export wildcards or netgroup names to DNS
 536          */
 537         if (!is_hostname(hostname1) || !is_hostname(hostname2))
 538                 return 0;
 539
 540         results1 = address_list(hostname1);
 541         if (results1 == NULL)
 542                 goto out;
 543         results2 = address_list(hostname2);
 544         if (results2 == NULL)
 545                 goto out;
 546
 547         if (strcasecmp(results1->ai_canonname, results2->ai_canonname) == 0) {
 548                 result = 1;
 549                 goto out;
 550         }
 551
 552         for (ai1 = results1; ai1 != NULL; ai1 = ai1->ai_next)
 553                 for (ai2 = results2; ai2 != NULL; ai2 = ai2->ai_next)
 554                         if (nfs_compare_sockaddr(ai1->ai_addr, ai2->ai_addr)) {
 555                                 result = 1;
 556                                 break;
 557                         }
 558
 559 out:
 560         freeaddrinfo(results1);
 561         freeaddrinfo(results2);
 562         return result;
 563 }
 564
 565 /* Based on mnt_table_parse_dir() in
 566    util-linux-ng/shlibs/mount/src/tab_parse.c */
 567 static void
 568 export_d_read(const char *dname)
 569 {
 570         int n = 0, i;
 571         struct dirent **namelist = NULL;
 572
 573
 574         n = scandir(dname, &namelist, NULL, versionsort);
 575         if (n < 0) {
 576                 if (errno == ENOENT)
 577                         /* Silently return */
 578                         return;
 579                 xlog(L_NOTICE, "scandir %s: %s", dname, strerror(errno));
 580         } else if (n == 0)
 581                 return;
 582
 583         for (i = 0; i < n; i++) {
 584                 struct dirent *d = namelist[i];
 585                 size_t namesz;
 586                 char fname[PATH_MAX + 1];
 587                 int fname_len;
 588
 589
 590                 if (d->d_type != DT_UNKNOWN
 591                     && d->d_type != DT_REG
 592                     && d->d_type != DT_LNK)
 593                         continue;
 594                 if (*d->d_name == '.')
 595                         continue;
 596
 597 #define _EXT_EXPORT_SIZ   (sizeof(_EXT_EXPORT) - 1)
 598                 namesz = strlen(d->d_name);
 599                 if (!namesz
 600                     || namesz < _EXT_EXPORT_SIZ + 1
 601                     || strcmp(d->d_name + (namesz - _EXT_EXPORT_SIZ),
 602                               _EXT_EXPORT))
 603                         continue;
 604
 605                 fname_len = snprintf(fname, PATH_MAX +1, "%s/%s", dname, d->d_name);
 606                 if (fname_len > PATH_MAX) {
 607                         xlog(L_WARNING, "Too long file name: %s in %s", d->d_name, dname);
 608                         continue;
 609                 }
 610
 611                 export_read(fname);
 612         }
 613
 614         for (i = 0; i < n; i++)
 615                 free(namelist[i]);
 616         free(namelist);
 617
 618         return;
 619 }
 620
 621 static char
 622 dumpopt(char c, char *fmt, ...)
 623 {
 624         va_list ap;
 625
 626         va_start(ap, fmt);
 627         printf("%c", c);
 628         vprintf(fmt, ap);
 629         va_end(ap);
 630         return ',';
 631 }
 632
 633 static void
 634 dump(int verbose)
 635 {
 636         nfs_export      *exp;
 637         struct exportent *ep;
 638         int             htype;
 639         char            *hname, c;
 640
 641         for (htype = 0; htype < MCL_MAXTYPES; htype++) {
 642                 for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
 643                         ep = &exp->m_export;
 644                         if (!exp->m_xtabent)
 645                             continue; /* neilb */
 646                         if (htype == MCL_ANONYMOUS)
 647                                 hname = "<world>";
 648                         else
 649                                 hname = ep->e_hostname;
 650                         if (strlen(ep->e_path) > 14)
 651                                 printf("%-14s\n\t\t%s", ep->e_path, hname);
 652                         else
 653                                 printf("%-14s\t%s", ep->e_path, hname);
 654                         if (!verbose) {
 655                                 printf("\n");
 656                                 continue;
 657                         }
 658                         c = '(';
 659                         if (ep->e_flags & NFSEXP_READONLY)
 660                                 c = dumpopt(c, "ro");
 661                         else
 662                                 c = dumpopt(c, "rw");
 663                         if (ep->e_flags & NFSEXP_ASYNC)
 664                                 c = dumpopt(c, "async");
 665                         if (ep->e_flags & NFSEXP_GATHERED_WRITES)
 666                                 c = dumpopt(c, "wdelay");
 667                         if (ep->e_flags & NFSEXP_NOHIDE)
 668                                 c = dumpopt(c, "nohide");
 669                         if (ep->e_flags & NFSEXP_CROSSMOUNT)
 670                                 c = dumpopt(c, "crossmnt");
 671                         if (ep->e_flags & NFSEXP_INSECURE_PORT)
 672                                 c = dumpopt(c, "insecure");
 673                         if (ep->e_flags & NFSEXP_ROOTSQUASH)
 674                                 c = dumpopt(c, "root_squash");
 675                         else
 676                                 c = dumpopt(c, "no_root_squash");
 677                         if (ep->e_flags & NFSEXP_ALLSQUASH)
 678                                 c = dumpopt(c, "all_squash");
 679                         if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
 680                                 c = dumpopt(c, "no_subtree_check");
 681                         if (ep->e_flags & NFSEXP_NOAUTHNLM)
 682                                 c = dumpopt(c, "insecure_locks");
 683                         if (ep->e_flags & NFSEXP_NOACL)
 684                                 c = dumpopt(c, "no_acl");
 685                         if (ep->e_flags & NFSEXP_FSID)
 686                                 c = dumpopt(c, "fsid=%d", ep->e_fsid);
 687                         if (ep->e_uuid)
 688                                 c = dumpopt(c, "fsid=%s", ep->e_uuid);
 689                         if (ep->e_mountpoint)
 690                                 c = dumpopt(c, "mountpoint%s%s",
 691                                             ep->e_mountpoint[0]?"=":"",
 692                                             ep->e_mountpoint);
 693                         if (ep->e_anonuid != 65534)
 694                                 c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
 695                         if (ep->e_anongid != 65534)
 696                                 c = dumpopt(c, "anongid=%d", ep->e_anongid);
 697                         switch(ep->e_fslocmethod) {
 698                         case FSLOC_NONE:
 699                                 break;
 700                         case FSLOC_REFER:
 701                                 c = dumpopt(c, "refer=%s", ep->e_fslocdata);
 702                                 break;
 703                         case FSLOC_REPLICA:
 704                                 c = dumpopt(c, "replicas=%s", ep->e_fslocdata);
 705                                 break;
 706 #ifdef DEBUG
 707                         case FSLOC_STUB:
 708                                 c = dumpopt(c, "fsloc=stub");
 709                                 break;
 710 #endif
 711                         }
 712                         secinfo_show(stdout, ep);
 713                         printf("%c\n", (c != '(')? ')' : ' ');
 714                 }
 715         }
 716 }
 717
 718 static void
 719 error(nfs_export *exp, int err)
 720 {
 721         xlog(L_ERROR, "%s:%s: %s", exp->m_client->m_hostname,
 722                 exp->m_export.e_path, strerror(err));
 723 }
 724
 725 static void
 726 usage(const char *progname)
 727 {
 728         fprintf(stderr, "usage: %s [-aruv] [host:/path]\n", progname);
 729         exit(1);
 730 }